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Oct 21, 2023 8:00:00 AM by Logan Donahue

Heater Bearings? What the $#%@ is That?!

If you are an HVAC novice, you may wonder what a heater bearing is...In this article, we are here to let you know!
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What Are Bearings?

Bearings are mechanical components used to reduce friction between moving parts and support the load they carry. In the context of a furnace, bearings play a crucial role in various components, including the blower motor and the fan. Bearings are typically small, circular devices that allow one part to rotate smoothly and efficiently within another part.

The role of bearings in a furnace

Furnaces rely on a blower motor and fan system to distribute heated air throughout a home. These systems work tirelessly to ensure consistent and comfortable temperatures. Bearings are integrated into the furnace's blower motor and fan to enable smooth, low-friction rotation of the various components. Without bearings, the rotating parts would wear out quickly, leading to a decreased lifespan of the furnace and poor efficiency.

How bearings contribute to noisy furnaces

While bearings are designed to promote smooth and quiet operation, several factors can cause them to become noisy over time:
  1. Wear and tear: Bearings have a limited lifespan and can wear down due to constant use. As they degrade, they can become noisier, producing grinding, squeaking, or rattling sounds.
  2. Lack of lubrication: Proper lubrication is essential for the smooth operation of bearings. Without adequate lubrication, bearings can generate friction and noise as they rotate.
  3. Contaminants: Dust and debris can find their way into the furnace's components, including the bearings. These contaminants can cause increased friction, leading to noise.
  4. Misalignment: Bearings must be correctly aligned to prevent unnecessary strain on the moving parts. Misalignment can result in noisy operation.
  5. Overheating: Furnaces generate a significant amount of heat. If the bearings are exposed to excessive heat, it can cause them to degrade faster and produce noise.
  6. Poor maintenance: Regular maintenance is crucial to keep a furnace running smoothly. Neglecting maintenance can lead to bearing issues and noisy operation.Consequences of Skipping Heater Tune-Ups
*Almost all bearings are now sealed and can not be lubricated. Only lubricate if stated in manufacturer's manual

Addressing noisy furnace bearings

To resolve noisy furnace bearings and ensure your furnace operates quietly and efficiently, consider the following steps:
  1. Regular maintenance: Schedule annual maintenance for your furnace. A professional technician can inspect and lubricate the bearings, ensuring they operate smoothly.
  2. *Lubrication: Check the manufacturer's recommendations for lubrication intervals and use the appropriate lubricant for your furnace's bearings.
  3. Cleaning: Keep your furnace and its components clean to prevent the buildup of dust and debris that can affect bearing performance.
  4. Replace worn bearings: If your bearings are significantly worn or damaged, it's advisable to replace them. A professional technician can perform this task effectively.
*Almost all bearings are now sealed and can not be lubricated. Only lubricate if stated in manufacturer's manual


Bearings are essential components in furnaces, ensuring the smooth operation of critical systems like blower motors and fans. When bearings are properly maintained and functioning, they contribute to a quiet and efficient furnace. However, if neglected or subjected to wear and tear, they can lead to noisy furnace operation. To maintain a peaceful and warm home, it's essential to recognize the significance of furnace bearings and take the necessary steps to address any issues that may arise. Regular maintenance and prompt bearing replacement when necessary are key to a quiet and efficient furnace.
Contact ECI Comfort

If you live in the Delaware Valley/Greater Philadelphia area and would like to find comfort within your home, visit our website or give us a call at 215 - 245 - 3200 to learn more.

This entry was posted in Heating, Furnace, Gas Furnace

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